Re: [SI-LIST] : Unit failing ESD testing

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Thu Nov 02 2000 - 17:54:56 PST


Have you tried those General Semiconductor Transient Suppressors (or similar)?

They are supposed to be very fast.

How do you exactly test this device?

What kind of device is it? How large?

Jeff Reeve wrote:

> SI List,
>
> ESD related situation (maybe due to EMI resulting from ESD?). I have a
> battery powered PCB surrounded by a plastic enclosure, on the rear of the
> enclosure are several pins that are used to charge the battery when the
> device is placed into a charger (similar to a cell phone). Contact points
> are 12V and GND on the rear of the unit. I would like to operate up to 8kV
> contact discharge to the unit (at the GND/12V contact) before the device
> exhibits failures. Presently, the device functions up to 4kV and then begins
> to exhibit failures (it resets itself and continues to operate). I have
> tried a very fast Zener across 12V and it did slightly improve things but
> not enough. There is a 1.5" ribbon cable from the battery PCB to the Digital
> PCB. I clamped a ferrite across the cable and that also seemed to help (good
> to 6kV) but that too was not enough. Maybe I have not given enough detail?
> But I ask the question: What are common means to improve immunity to ESD
> contact discharge? Perhaps someone is willing to share their experiences or
> pointers to papers?
>
> Many thanks in advance for your sharing...this is a awesome list!
> Jeff
>
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